Hydraulic Creep
Hi, we have a 2021 Montana 3121rl and experienced the exact same thing after only a couple of months of ownership. Turns out that if the system begins to lose pressure the jack that is connected closest to the pump and reservoir will start to lower. The problem for us was a leaky solenoid vale on the main distribution manifold, ours is also in the battery compartment. Was under warranty so I have no idea as to the cost. It took Camping World about one hour to put a new valve in.
Hope this helps. good lick,
Terry W
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